# How a Panel Painting Was Actually Built > A panel painting is a joinery problem and a glue problem before it is an image. What the wood, the gesso and the punch marks will tell you about who made it, and when. > The Study - 2026-08-02 > Canonical HTML: https://iconotheca.com/study/how-a-panel-painting-was-built/ ## Key points - Italian panels are usually poplar, willow or lime; Netherlandish panels are usually Baltic oak, and only the oak can normally be tree-ring dated. - Cennini's ground is a two-part system: coarse gesso grosso for body, then at least eight coats of gesso sottile scraped back until the surface reads like ivory. - Punch marks in a gold ground identify a workshop and its tools rather than a hand, because punches were inherited and lent between shops. - Most of the structural damage on the panel market was inflicted by restorers - thinning, cradling and transfer - and not by the wood. ## The carpenter decides what can be proved about the picture five centuries later ## The ground is where the picture actually lives ## Gold is part of the structure, and after about 1450 it is a statement ## Punch marks are workshop evidence, not a signature ## Panels warp, and then restorers split them Read the back of the panel before the front. The species and the cut tell you which market the wood came from and whether the object can ever be tree-ring dated. The ground tells you which side of the Alps the workshop trained on. The punches tell you which shop's tools were in the room. The battens, the planing marks and the fill in a butterfly socket tell you what the last three hundred years of ownership did to it. All of that is physical evidence that was laid down before anyone had a reason to lie about the picture, and it is available to anyone willing to look at the object rather than the label. ## Questions **Can an Italian poplar panel be dated by dendrochronology?** Usually not. The method depends on matching a measured ring series against a regional master chronology, and the well-developed chronologies are for oak, which is why Netherlandish, German and English panels are routinely dated and Italian poplar ones are not. Where oak is present, the result is still only an earliest possible date, because sapwood was cut away and the timber was seasoned before use. **Does a cradle on the reverse damage value?** It is a condition fact rather than an authenticity fact, and it usually comes bundled with thinning, since panels were planed down before cradling. What matters commercially is whether the cradle has caused splits or paint-layer stress, and whether it has been converted or removed by a structural specialist. A cradled panel with a stable, documented treatment history is a very different object from a cradled panel that has never been opened up. **Is a canvas embedded in the gesso a sign of a later intervention?** No. Sizing the wood and covering it with linen before the ground is standard practice described by Cennini, and the cloth is found within the gesso of period panels, including the Cimabue Mocking of Christ. A cloth layer applied over the paint, or a panel glued to a secondary board, is a different matter and does belong in the treatment history. **What does a punch-mark match actually establish?** That two pictures were decorated with the same physical tool. Because punches were inherited and lent, that supports placement in a workshop or a tool-sharing circle. It becomes an attribution argument only in combination with the rest of the technical and documentary evidence. ## Sources - [1] Wikipedia, 'Panel painting'. Tertiary source; the underlying claims should be replaced with the Getty and museum technical literature cited below. - [2] University of Delaware, Art Conservation Department (Kress Program), 'Historical Materials/Techniques': gesso grosso and gesso sottile, Cennini's eight coats, charcoal-and-scraper finishing. - [3] Wikipedia, 'Gold ground': bole, water gilding, burnishing, mordant gilding, shell gold, punching. Tertiary source; replace with Skaug and the National Gallery technical bulletins. - [4] Kress Paintings Conservation, 'One of Our Most Delightful Branches: Punchwork in Trecento Tuscany'. - [5] Peter Klein, 'A note on dendrochronological analyses of panel paintings at the National Gallery of Victoria', NGV Art Journal 40. - [6] Wikipedia, 'Conservation and restoration of panel paintings': environmental targets, pests, minimal intervention. Tertiary source. - [7] Wikipedia, 'Transfer of panel paintings': Naples and Cremona 1711-1725, the Hacquin workshop, Picault, Godefroid, Sebastiano del Piombo 1771. Tertiary source. - [8] Wikipedia, 'Mona Lisa': poplar support, crack, walnut butterfly braces, display case conditions, 1951 frame. Tertiary source; the primary record is the C2RMF examination of 2004-05. - [9] Getty, 'The Structural Conservation of Panel Paintings: Proceedings of a Symposium at the J. Paul Getty Museum, April 1995'. - [10] Wikipedia, 'The Mocking of Christ (Cimabue)': egg tempera and gold leaf on a thinned poplar panel with canvas embedded in the gesso, 25.8 x 20.3 x 1.2 cm. Tertiary source; replace with the Louvre acquisition file.